Throughout the petrochemical and refining industry, the separation of olefins and paraffins is generally performed via distillation, a costly and capital intensive method, particularly for light olefins. This project uses a silver-incorporated custom amorphous fluoropolymer membrane to separate olefins and paraffins. Compared to previous attempts using facilitated transport membranes, this membrane has been shown to have very good longevity in laboratory settings and has been tested with reasonably-expected process poisons. The objective of this project is to gain a better understanding of the membrane performance in realistic operating conditions through both real world testing and fundamental modelling of the membrane system. It targets the case of integrating a membrane module in a process to recover propylene from propane in a polymerization reactor purge stream, with the propylene recycled to the reactor.
Ethane can represent up to 20 vol.% of shale-gas, exceeding the 10 vol. % allowed in “pipeline-quality” natural gas. Each year, over 210 million barrels (liquid equivalent) of ethane are rejected in the lower 48 states. Upgrading low- to negative-value ethane to easily transportable liquid fuels is a promising solution to this supply glut. The key to this process is development of modular systems that can operate economically at stranded sites. Conventional gas-to-liquids (GTL) technologies face significant challenges such as high capital cost and limited efficiency. This project will develop a fundamentally improved modular ethane-to-liquids (M-ETL) concept. The proposed M-ETL technology uses a modular Chemical Looping-Oxidative Dehydrogenation (CL-ODH) system to convert ethane and natural gas liquids (NGLs) efficiently into olefins (primarily ethylene) via cyclic redox reactions of highly-effective redox catalyst particles. The resulting olefins are converted to gasoline and mid-distillate products via oligomerization. The proposed project will also advance the M-ETL technology to make it ready for full-scale demonstration. A pilot-scale testbed will be designed and constructed for CL-ODH demonstration. The reactor channels of the testbed will be at a scale comparable to those of the proposed modular system.
This project will demonstrate conversion of a large-volume chemical commodities process from batch to continuous processing. It is focused to create an order of magnitude reduction in equipment size (and associated capital cost) by transitioning the traditionally batch production of dispersants, specifically succinimide dispersants, into a continuous process. Succinimide dispersants are a relatively large volume family of products that vary by molecular weight, and structure. Application and adoption of intensified, continuous processing principles offers the prospect of revolutionizing their manufacture. The project will look to establish a firm kinetic understanding of the proposed chemistry and to develop reactor modeling tools so that reaction and mass transfer requirements can be balanced while minimizing system volume, ultimately leading to construction and demonstration of an industrial pilot plant. Successful demonstration of a batch to continuous process at previously unrealized scales could open the door for a broader shift to continuous processing in the fine/ specialty chemical industries.
Ethane can represent up to 20 vol.% of shale-gas, exceeding the 10 vol. % allowed in “pipeline-quality” natural gas. Each year, over 210 million barrels (liquid equivalent) of ethane are rejected in the lower 48 states. Upgrading low- to negative-value ethane to easily transportable liquid fuels is a promising solution to this supply glut. The key to this process is development of modular systems that can operate economically at stranded sites. Conventional gas-to-liquids (GTL) technologies face significant challenges such as high capital cost and limited efficiency. This project will develop a fundamentally improved modular ethane-to-liquids (M-ETL) concept. The proposed M-ETL technology uses a modular Chemical Looping-Oxidative Dehydrogenation (CL-ODH) system to convert ethane and natural gas liquids (NGLs) efficiently into olefins (primarily ethylene) via cyclic redox reactions of highly-effective redox catalyst particles. The resulting olefins are converted to gasoline and mid-distillate products via oligomerization. The proposed project will also advance the M-ETL technology to make it ready for full-scale demonstration. A pilot-scale testbed will be designed and constructed for CL-ODH demonstration. The reactor channels of the testbed will be at a scale comparable to those of the proposed modular system.
The current approach to p-xylene production includes an isomerization step that gives a nearly equilibrium distribution of mixed xylenes, followed by a separate step to recover p-xylene, then recycling of p-xylene depleted product for further isomerization. This project aims to develop and validate para-xylene ultra-selective zeolite membranes and integrate them with an appropriately designed isomerization catalyst in a membrane reactor to accomplish selective para-xylene production. A successful membrane reactor will increase the yield of para-xylene beyond the limits of equilibrium by selectively removing para-xylene from the reactor as it is produced. Increased productivity and reduced separation energy, capital intensity, and greenhouse gas emissions are the key drivers for developing such an approach. Recent breakthroughs introduced by the University of Minnesota for the synthesis of zeolite membranes using ultrathin zeolite crystals (2-dimensional zeolites and zeolite nanosheets) enabled unprecedented mixture separation factors for para-xylene over its isomers (up to 10,000). This ultra-selective performance has been validated by measurements at ExxonMobil Research and Engineering Company and membranes are currently being tested at temperatures, compositions and pressures relevant to membrane reactor operation.
